Wash Up
To clean ink and fountain solutions from rollers, fountains, screens, and other press components

Waste
Unusable paper or paper damage during normal makeready, printing or binding operations, as compared to spoilage.

Watermark
Translucent logo in paper created during manufacturing by slight embossing from a dandy roll while paper is still approximately 90 percent water.

Web Break
Split of the paper as it travels through a web press, causing operators to rethread the press.

Web Gain
Unacceptable stretching of paper as it passes through the press.

Web Press
Press that prints from rolls of paper, usually cutting it into sheets after printing. Also called reel-fed press. Web presses come in many sizes, the most common being mini, half, three quarter (also called 8-pages) and full (also called 16-pages).

Wet Trap
To print ink or varnish over wet ink, as compared to dry trap.

Window
(1) In a printed product, a die-cut hole revealing an image on the sheet behind it.

Wire Side
Side of the paper that rests against The Fourdrinier wire during papermaking, as compared to felt side.

With the Grain
Parallel to the grain direction of the paper being used, as compared to against the grain. See also Grain Direction.

Woodfree Paper
Made with chemical pulp only. Paper usually classified as calendered or supercalendered

Working Film
Intermediate film that will be copied to make final film after all corrections are made. Also called buildups

Wove
Paper manufactured without visible wire marks, usually a fine textured paper.

Wrong Reading
An image that is backwards when compared to the original. Also called flopped and reverse reading.